Plaster lath



Aug; 3 192e. 4 1,594,661 O. CARLSON PLASTER LATI-I Filed July 5 1923 'rus iss/isti rarsur ortica.

OLE CARLSON, OF LOS ANGELESQCALIFORNIA, ASSIGNOR OF ONEeHALF TO C. F.

W'IESTBURG, OF LOS ANGELES, CALIFORNIA.

rnnsfrnn LATE.

Application led July 3,

My present invention is a pla-ster lath, and it is a special object of this invention to provide a plaster lath adapted to be made from thin boards, which may be of varying width but which are preferably of a standard length, such as thirty or thirty-six inches, although odd lengths are entirely suitable for some of the uses Lo which my plaster lath is especially adapted.

It is an object of this invention to pro vide a novel plaster lath which may optionally be made from stock' which would otherwise go to waste, my plaster lath be ing especially suitable for economical use when lathing is to be applied directly upon a flat surface, without provision for air space between my plaster-lath and the said surface.

Although my invention has unique advantages adapting it to use upon preexistent perfect or imperfect flat surfaces, it should be understood that my plaster lath is a highly advantageous form of lathing for use in any ordinary building construction, in which separate wooden laths or expanded metal lathing, or the like, have heretofore been used, both of my herein shown constructions being such as to provide a strong and flexible foundation, suitable for use upon either regular or irregular surfaces, and requiring a minimum quantity of plaster in order to form asatisfactory key, for securing the plaster in place; and in a preferred construction I provide my plaster lath not only with staggered slots, which need not be undercut, but also with round holes, which are preferably undercut, in order to provide a sufficient and suitable key for the plaster secured thereby.

Other objects of my invention will appear from the following description of two preferred embodiments thereof, and from'the appended claims, taken in connection with the accompanying drawings, inV which- Fig. 1 may be regarded as a back elevation of one form of plaster lath embodying` my invention.

Fig. 2 is a longitudinal section on the line 2-2 of Fig. 1.

Fig. 3 is a transverse sectional view show- -ing how a key may be formed whenthe plaster. lath of Figs. 1 and 2 is used upon ordinary studding or where an air space is to be provided.

Fig. d is a similar view, showing how my 192e. sensi No. 649,252.

plaster lath may .beV employed directly upon a flat surface of wood, or the like.

Referring in detail to the parts of that .specific embodiment of my invention shown in Figs. 1, 2, 3 and 4, 1 being a plaster lath of any desired dimensions, such asten by thirty-six inches, and a quarter of an inch, more or less, in thickness, 2 are slits or slots, preferably extending approximately in the direction of the grain of the board from which my lath is formed, and 8 are additional circular openings cut through the said board, these openingsk being shown, in the present instance, as cut in the line of the slits or slots 2, and undercut or tapered or flared at 4 in the manner best shown in Figs. 8 and Li, in order to permit a spreading or keying of the plaster 5.

I am aware that a plaster lath has heretofore been formed by forming slots in boards, and I am aware that wood lath has also been formed by providing circular apertures in boards; but I obtain a novel and advantageous result by the conjoint use of slots and circular apertures, and I find it highly advantageous, from the standpoint of economy in the use of plaster, to undercut only the mentioned circular apertures, my described slots being adequate to prevent a lateral movement of the plaster relatively to a wall, and the undercutting of the circular apertures being sufficient to key the same against outward displacement. It will be understood that before plaster is applied to my novel'plaster lath, the same should be thoroughly wet, inl the manner well known to workers in this art.

Although I have herein described but two complete embodiments of my invention, it should be understood that various features thereof might be independently employed, and also that various modifications might be made without departure from the spirit and scope of my invention as the same is indicated above and in the following claims.

What I claim is l. A lath formed of a boar'l or equivalent homogeneous material having a series of parallel slots through the board from front to back, the slots of each series being spaced apart at their ends Vand each row being staggered whereby sufficient solid board is left to give strength to the lath, and a plurality of undercuts of partially conical form with the basesof the partial cones at the 2. A Wall structure comprising a flat Yback-v ing, a facing of la-ths secured directly thereon, each lath being `formed -ofa boa-nd or equivalent homogeneous material having a series of parallel slots through the board from front to hack, the slots of each Series being spaced apart attheir `ends :and each row being staggered whereby sufficient solid board is left to give vstrength nIto the lath,

a plural-ity of undercut-s of partially conical form with the bases of the partial'cones at vtheback of the board and merging into each slot, and with .a coating yof k,plaster on the fIn teetimony whereof I have signed my 20 name to this specification.

y oLE CARLSON. 

